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https://github.com/ergochat/ergo.git
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Merge pull request #1445 from slingamn/flatiptypes.5
introduce "flat ip" representations
This commit is contained in:
Shivaram Lingamneni
GitHub
commit
58edabf5c3
1
Makefile
1
Makefile
@ -25,6 +25,7 @@ test:
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cd irc/cloaks && go test . && go vet .
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cd irc/connection_limits && go test . && go vet .
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cd irc/email && go test . && go vet .
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cd irc/flatip && go test . && go vet .
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cd irc/history && go test . && go vet .
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cd irc/isupport && go test . && go vet .
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cd irc/migrations && go test . && go vet .
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@ -247,9 +247,6 @@ server:
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window: 10m
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# maximum number of new connections per IP/CIDR within the given duration
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max-connections-per-window: 32
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# how long to ban offenders for. after banning them, the number of connections is
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# reset, which lets you use /UNDLINE to unban people
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throttle-ban-duration: 10m
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# how wide the CIDR should be for IPv4 (a /32 is a fully specified IPv4 address)
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cidr-len-ipv4: 32
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@ -21,6 +21,7 @@ import (
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ident "github.com/oragono/go-ident"
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"github.com/oragono/oragono/irc/caps"
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"github.com/oragono/oragono/irc/connection_limits"
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"github.com/oragono/oragono/irc/flatip"
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"github.com/oragono/oragono/irc/history"
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"github.com/oragono/oragono/irc/modes"
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"github.com/oragono/oragono/irc/sno"
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@ -1477,7 +1478,7 @@ func (client *Client) destroy(session *Session) {
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if session.proxiedIP != nil {
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ip = session.proxiedIP
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}
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client.server.connectionLimiter.RemoveClient(ip)
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client.server.connectionLimiter.RemoveClient(flatip.FromNetIP(ip))
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source = ip.String()
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}
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client.server.logger.Info("connect-ip", fmt.Sprintf("disconnecting session of %s from %s", details.nick, source))
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@ -4,12 +4,13 @@
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package connection_limits
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import (
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"crypto/md5"
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"errors"
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"fmt"
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"net"
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"sync"
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"time"
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"github.com/oragono/oragono/irc/flatip"
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"github.com/oragono/oragono/irc/utils"
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)
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@ -26,10 +27,15 @@ type CustomLimitConfig struct {
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// tuples the key-value pair of a CIDR and its custom limit/throttle values
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type customLimit struct {
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name string
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name [16]byte
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maxConcurrent int
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maxPerWindow int
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nets []net.IPNet
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nets []flatip.IPNet
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}
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type limiterKey struct {
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maskedIP flatip.IP
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prefixLen uint8 // 0 for the fake nets we generate for custom limits
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}
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// LimiterConfig controls the automated connection limits.
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@ -42,7 +48,6 @@ type rawLimiterConfig struct {
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Throttle bool
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Window time.Duration
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MaxPerWindow int `yaml:"max-connections-per-window"`
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BanDuration time.Duration `yaml:"throttle-ban-duration"`
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CidrLenIPv4 int `yaml:"cidr-len-ipv4"`
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CidrLenIPv6 int `yaml:"cidr-len-ipv6"`
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@ -55,9 +60,7 @@ type rawLimiterConfig struct {
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type LimiterConfig struct {
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rawLimiterConfig
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ipv4Mask net.IPMask
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ipv6Mask net.IPMask
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exemptedNets []net.IPNet
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exemptedNets []flatip.IPNet
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customLimits []customLimit
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}
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@ -69,15 +72,19 @@ func (config *LimiterConfig) UnmarshalYAML(unmarshal func(interface{}) error) (e
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}
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func (config *LimiterConfig) postprocess() (err error) {
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config.exemptedNets, err = utils.ParseNetList(config.Exempted)
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exemptedNets, err := utils.ParseNetList(config.Exempted)
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if err != nil {
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return fmt.Errorf("Could not parse limiter exemption list: %v", err.Error())
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}
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config.exemptedNets = make([]flatip.IPNet, len(exemptedNets))
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for i, exempted := range exemptedNets {
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config.exemptedNets[i] = flatip.FromNetIPNet(exempted)
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}
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for identifier, customLimitConf := range config.CustomLimits {
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nets := make([]net.IPNet, len(customLimitConf.Nets))
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nets := make([]flatip.IPNet, len(customLimitConf.Nets))
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for i, netStr := range customLimitConf.Nets {
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normalizedNet, err := utils.NormalizedNetFromString(netStr)
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normalizedNet, err := flatip.ParseToNormalizedNet(netStr)
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if err != nil {
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return fmt.Errorf("Bad net %s in custom-limits block %s: %w", netStr, identifier, err)
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}
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@ -86,23 +93,20 @@ func (config *LimiterConfig) postprocess() (err error) {
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if len(customLimitConf.Nets) == 0 {
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// see #1421: this is the legacy config format where the
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// dictionary key of the block is a CIDR string
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normalizedNet, err := utils.NormalizedNetFromString(identifier)
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normalizedNet, err := flatip.ParseToNormalizedNet(identifier)
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if err != nil {
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return fmt.Errorf("Custom limit block %s has no defined nets", identifier)
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}
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nets = []net.IPNet{normalizedNet}
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nets = []flatip.IPNet{normalizedNet}
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}
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config.customLimits = append(config.customLimits, customLimit{
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maxConcurrent: customLimitConf.MaxConcurrent,
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maxPerWindow: customLimitConf.MaxPerWindow,
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name: "*" + identifier,
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name: md5.Sum([]byte(identifier)),
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nets: nets,
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})
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}
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config.ipv4Mask = net.CIDRMask(config.CidrLenIPv4, 32)
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config.ipv6Mask = net.CIDRMask(config.CidrLenIPv6, 128)
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return nil
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}
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@ -113,53 +117,56 @@ type Limiter struct {
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config *LimiterConfig
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// IP/CIDR -> count of clients connected from there:
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limiter map[string]int
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limiter map[limiterKey]int
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// IP/CIDR -> throttle state:
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throttler map[string]ThrottleDetails
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throttler map[limiterKey]ThrottleDetails
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}
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// addrToKey canonicalizes `addr` to a string key, and returns
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// the relevant connection limit and throttle max-per-window values
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func (cl *Limiter) addrToKey(addr net.IP) (key string, limit int, throttle int) {
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// `key` will be a CIDR string like "8.8.8.8/32" or "2001:0db8::/32"
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func (cl *Limiter) addrToKey(addr flatip.IP) (key limiterKey, limit int, throttle int) {
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for _, custom := range cl.config.customLimits {
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for _, net := range custom.nets {
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if net.Contains(addr) {
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return custom.name, custom.maxConcurrent, custom.maxPerWindow
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return limiterKey{maskedIP: custom.name, prefixLen: 0}, custom.maxConcurrent, custom.maxPerWindow
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}
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}
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}
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var ipNet net.IPNet
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addrv4 := addr.To4()
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if addrv4 != nil {
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ipNet = net.IPNet{
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IP: addrv4.Mask(cl.config.ipv4Mask),
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Mask: cl.config.ipv4Mask,
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}
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var prefixLen int
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if addr.IsIPv4() {
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prefixLen = cl.config.CidrLenIPv4
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addr = addr.Mask(prefixLen, 32)
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prefixLen += 96
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} else {
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ipNet = net.IPNet{
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IP: addr.Mask(cl.config.ipv6Mask),
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Mask: cl.config.ipv6Mask,
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prefixLen = cl.config.CidrLenIPv6
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addr = addr.Mask(prefixLen, 128)
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}
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}
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return ipNet.String(), cl.config.MaxConcurrent, cl.config.MaxPerWindow
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return limiterKey{maskedIP: addr, prefixLen: uint8(prefixLen)}, cl.config.MaxConcurrent, cl.config.MaxPerWindow
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}
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// AddClient adds a client to our population if possible. If we can't, throws an error instead.
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func (cl *Limiter) AddClient(addr net.IP) error {
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func (cl *Limiter) AddClient(addr flatip.IP) error {
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cl.Lock()
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defer cl.Unlock()
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// we don't track populations for exempted addresses or nets - this is by design
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if utils.IPInNets(addr, cl.config.exemptedNets) {
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if flatip.IPInNets(addr, cl.config.exemptedNets) {
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return nil
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}
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addrString, maxConcurrent, maxPerWindow := cl.addrToKey(addr)
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// XXX check throttle first; if we checked limit first and then checked throttle,
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// we'd have to decrement the limit on an unsuccessful throttle check
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// check limiter
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var count int
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if cl.config.Count {
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count = cl.limiter[addrString] + 1
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if count > maxConcurrent {
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return ErrLimitExceeded
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}
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}
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if cl.config.Throttle {
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details := cl.throttler[addrString] // retrieve mutable throttle state from the map
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// add in constant state to process the limiting operation
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@ -171,16 +178,13 @@ func (cl *Limiter) AddClient(addr net.IP) error {
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throttled, _ := g.Touch() // actually check the limit
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cl.throttler[addrString] = g.ThrottleDetails // store modified mutable state
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if throttled {
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// back out the limiter add
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return ErrThrottleExceeded
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}
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}
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// now check limiter
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// success, record in limiter
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if cl.config.Count {
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count := cl.limiter[addrString] + 1
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if count > maxConcurrent {
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return ErrLimitExceeded
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}
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cl.limiter[addrString] = count
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}
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@ -188,11 +192,11 @@ func (cl *Limiter) AddClient(addr net.IP) error {
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}
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// RemoveClient removes the given address from our population
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func (cl *Limiter) RemoveClient(addr net.IP) {
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func (cl *Limiter) RemoveClient(addr flatip.IP) {
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cl.Lock()
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defer cl.Unlock()
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if !cl.config.Count || utils.IPInNets(addr, cl.config.exemptedNets) {
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if !cl.config.Count || flatip.IPInNets(addr, cl.config.exemptedNets) {
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return
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}
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@ -206,11 +210,11 @@ func (cl *Limiter) RemoveClient(addr net.IP) {
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}
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// ResetThrottle resets the throttle count for an IP
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func (cl *Limiter) ResetThrottle(addr net.IP) {
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func (cl *Limiter) ResetThrottle(addr flatip.IP) {
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cl.Lock()
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defer cl.Unlock()
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if !cl.config.Throttle || utils.IPInNets(addr, cl.config.exemptedNets) {
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if !cl.config.Throttle || flatip.IPInNets(addr, cl.config.exemptedNets) {
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return
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}
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@ -224,10 +228,10 @@ func (cl *Limiter) ApplyConfig(config *LimiterConfig) {
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defer cl.Unlock()
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if cl.limiter == nil {
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cl.limiter = make(map[string]int)
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cl.limiter = make(map[limiterKey]int)
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}
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if cl.throttler == nil {
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cl.throttler = make(map[string]ThrottleDetails)
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cl.throttler = make(map[limiterKey]ThrottleDetails)
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}
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cl.config = config
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@ -4,15 +4,17 @@
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package connection_limits
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import (
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"net"
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"crypto/md5"
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"testing"
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"time"
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"github.com/oragono/oragono/irc/flatip"
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)
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func easyParseIP(ipstr string) (result net.IP) {
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result = net.ParseIP(ipstr)
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if result == nil {
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panic(ipstr)
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func easyParseIP(ipstr string) (result flatip.IP) {
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result, err := flatip.ParseIP(ipstr)
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if err != nil {
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panic(err)
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}
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return
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}
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@ -47,18 +49,23 @@ func TestKeying(t *testing.T) {
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var limiter Limiter
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limiter.ApplyConfig(&config)
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// an ipv4 /32 looks like a /128 to us after applying the 4-in-6 mapping
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key, maxConc, maxWin := limiter.addrToKey(easyParseIP("1.1.1.1"))
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assertEqual(key, "1.1.1.1/32", t)
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assertEqual(key.prefixLen, uint8(128), t)
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assertEqual(key.maskedIP[12:], []byte{1, 1, 1, 1}, t)
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assertEqual(maxConc, 4, t)
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assertEqual(maxWin, 8, t)
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key, maxConc, maxWin = limiter.addrToKey(easyParseIP("2607:5301:201:3100::7426"))
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assertEqual(key, "2607:5301:201:3100::/64", t)
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testIPv6 := easyParseIP("2607:5301:201:3100::7426")
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key, maxConc, maxWin = limiter.addrToKey(testIPv6)
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assertEqual(key.prefixLen, uint8(64), t)
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assertEqual(flatip.IP(key.maskedIP), easyParseIP("2607:5301:201:3100::"), t)
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assertEqual(maxConc, 4, t)
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assertEqual(maxWin, 8, t)
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key, maxConc, maxWin = limiter.addrToKey(easyParseIP("8.8.4.4"))
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assertEqual(key, "*google", t)
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assertEqual(key.prefixLen, uint8(0), t)
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assertEqual([16]byte(key.maskedIP), md5.Sum([]byte("google")), t)
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assertEqual(maxConc, 128, t)
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assertEqual(maxWin, 256, t)
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}
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@ -4,7 +4,6 @@
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package connection_limits
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import (
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"net"
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"reflect"
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"testing"
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"time"
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@ -83,7 +82,7 @@ func makeTestThrottler(v4len, v6len int) *Limiter {
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func TestConnectionThrottle(t *testing.T) {
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throttler := makeTestThrottler(32, 64)
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addr := net.ParseIP("8.8.8.8")
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addr := easyParseIP("8.8.8.8")
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for i := 0; i < 3; i += 1 {
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err := throttler.AddClient(addr)
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@ -97,14 +96,14 @@ func TestConnectionThrottleIPv6(t *testing.T) {
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throttler := makeTestThrottler(32, 64)
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var err error
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err = throttler.AddClient(net.ParseIP("2001:0db8::1"))
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err = throttler.AddClient(easyParseIP("2001:0db8::1"))
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assertEqual(err, nil, t)
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err = throttler.AddClient(net.ParseIP("2001:0db8::2"))
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err = throttler.AddClient(easyParseIP("2001:0db8::2"))
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assertEqual(err, nil, t)
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err = throttler.AddClient(net.ParseIP("2001:0db8::3"))
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err = throttler.AddClient(easyParseIP("2001:0db8::3"))
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assertEqual(err, nil, t)
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err = throttler.AddClient(net.ParseIP("2001:0db8::4"))
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err = throttler.AddClient(easyParseIP("2001:0db8::4"))
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assertEqual(err, ErrThrottleExceeded, t)
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}
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@ -112,13 +111,13 @@ func TestConnectionThrottleIPv4(t *testing.T) {
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throttler := makeTestThrottler(24, 64)
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var err error
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err = throttler.AddClient(net.ParseIP("192.168.1.101"))
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err = throttler.AddClient(easyParseIP("192.168.1.101"))
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assertEqual(err, nil, t)
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err = throttler.AddClient(net.ParseIP("192.168.1.102"))
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err = throttler.AddClient(easyParseIP("192.168.1.102"))
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assertEqual(err, nil, t)
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err = throttler.AddClient(net.ParseIP("192.168.1.103"))
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err = throttler.AddClient(easyParseIP("192.168.1.103"))
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assertEqual(err, nil, t)
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err = throttler.AddClient(net.ParseIP("192.168.1.104"))
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err = throttler.AddClient(easyParseIP("192.168.1.104"))
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assertEqual(err, ErrThrottleExceeded, t)
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}
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73
irc/dline.go
73
irc/dline.go
@ -11,6 +11,7 @@ import (
|
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"sync"
|
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"time"
|
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|
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"github.com/oragono/oragono/irc/flatip"
|
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"github.com/oragono/oragono/irc/utils"
|
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"github.com/tidwall/buntdb"
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)
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@ -54,34 +55,22 @@ func (info IPBanInfo) BanMessage(message string) string {
|
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return message
|
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}
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|
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// dLineNet contains the net itself and expiration time for a given network.
|
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type dLineNet struct {
|
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// Network is the network that is blocked.
|
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// This is always an IPv6 CIDR; IPv4 CIDRs are translated with the 4-in-6 prefix,
|
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// individual IPv4 and IPV6 addresses are translated to the relevant /128.
|
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Network net.IPNet
|
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// Info contains information on the ban.
|
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Info IPBanInfo
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}
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// DLineManager manages and dlines.
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type DLineManager struct {
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sync.RWMutex // tier 1
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persistenceMutex sync.Mutex // tier 2
|
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// networks that are dlined:
|
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// XXX: the keys of this map (which are also the database persistence keys)
|
||||
// are the human-readable representations returned by NetToNormalizedString
|
||||
networks map[string]dLineNet
|
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networks map[flatip.IPNet]IPBanInfo
|
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// this keeps track of expiration timers for temporary bans
|
||||
expirationTimers map[string]*time.Timer
|
||||
expirationTimers map[flatip.IPNet]*time.Timer
|
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server *Server
|
||||
}
|
||||
|
||||
// NewDLineManager returns a new DLineManager.
|
||||
func NewDLineManager(server *Server) *DLineManager {
|
||||
var dm DLineManager
|
||||
dm.networks = make(map[string]dLineNet)
|
||||
dm.expirationTimers = make(map[string]*time.Timer)
|
||||
dm.networks = make(map[flatip.IPNet]IPBanInfo)
|
||||
dm.expirationTimers = make(map[flatip.IPNet]*time.Timer)
|
||||
dm.server = server
|
||||
|
||||
dm.loadFromDatastore()
|
||||
@ -96,9 +85,8 @@ func (dm *DLineManager) AllBans() map[string]IPBanInfo {
|
||||
dm.RLock()
|
||||
defer dm.RUnlock()
|
||||
|
||||
// map keys are already the human-readable forms, just return a copy of the map
|
||||
for key, info := range dm.networks {
|
||||
allb[key] = info.Info
|
||||
allb[key.String()] = info
|
||||
}
|
||||
|
||||
return allb
|
||||
@ -122,9 +110,9 @@ func (dm *DLineManager) AddNetwork(network net.IPNet, duration time.Duration, re
|
||||
return dm.persistDline(id, info)
|
||||
}
|
||||
|
||||
func (dm *DLineManager) addNetworkInternal(network net.IPNet, info IPBanInfo) (id string) {
|
||||
network = utils.NormalizeNet(network)
|
||||
id = utils.NetToNormalizedString(network)
|
||||
func (dm *DLineManager) addNetworkInternal(network net.IPNet, info IPBanInfo) (id flatip.IPNet) {
|
||||
flatnet := flatip.FromNetIPNet(network)
|
||||
id = flatnet
|
||||
|
||||
var timeLeft time.Duration
|
||||
if info.Duration != 0 {
|
||||
@ -137,12 +125,9 @@ func (dm *DLineManager) addNetworkInternal(network net.IPNet, info IPBanInfo) (i
|
||||
dm.Lock()
|
||||
defer dm.Unlock()
|
||||
|
||||
dm.networks[id] = dLineNet{
|
||||
Network: network,
|
||||
Info: info,
|
||||
}
|
||||
dm.networks[flatnet] = info
|
||||
|
||||
dm.cancelTimer(id)
|
||||
dm.cancelTimer(flatnet)
|
||||
|
||||
if info.Duration == 0 {
|
||||
return
|
||||
@ -154,29 +139,29 @@ func (dm *DLineManager) addNetworkInternal(network net.IPNet, info IPBanInfo) (i
|
||||
dm.Lock()
|
||||
defer dm.Unlock()
|
||||
|
||||
netBan, ok := dm.networks[id]
|
||||
if ok && netBan.Info.TimeCreated.Equal(timeCreated) {
|
||||
delete(dm.networks, id)
|
||||
banInfo, ok := dm.networks[flatnet]
|
||||
if ok && banInfo.TimeCreated.Equal(timeCreated) {
|
||||
delete(dm.networks, flatnet)
|
||||
// TODO(slingamn) here's where we'd remove it from the radix tree
|
||||
delete(dm.expirationTimers, id)
|
||||
delete(dm.expirationTimers, flatnet)
|
||||
}
|
||||
}
|
||||
dm.expirationTimers[id] = time.AfterFunc(timeLeft, processExpiration)
|
||||
dm.expirationTimers[flatnet] = time.AfterFunc(timeLeft, processExpiration)
|
||||
|
||||
return
|
||||
}
|
||||
|
||||
func (dm *DLineManager) cancelTimer(id string) {
|
||||
oldTimer := dm.expirationTimers[id]
|
||||
func (dm *DLineManager) cancelTimer(flatnet flatip.IPNet) {
|
||||
oldTimer := dm.expirationTimers[flatnet]
|
||||
if oldTimer != nil {
|
||||
oldTimer.Stop()
|
||||
delete(dm.expirationTimers, id)
|
||||
delete(dm.expirationTimers, flatnet)
|
||||
}
|
||||
}
|
||||
|
||||
func (dm *DLineManager) persistDline(id string, info IPBanInfo) error {
|
||||
func (dm *DLineManager) persistDline(id flatip.IPNet, info IPBanInfo) error {
|
||||
// save in datastore
|
||||
dlineKey := fmt.Sprintf(keyDlineEntry, id)
|
||||
dlineKey := fmt.Sprintf(keyDlineEntry, id.String())
|
||||
// assemble json from ban info
|
||||
b, err := json.Marshal(info)
|
||||
if err != nil {
|
||||
@ -199,8 +184,8 @@ func (dm *DLineManager) persistDline(id string, info IPBanInfo) error {
|
||||
return err
|
||||
}
|
||||
|
||||
func (dm *DLineManager) unpersistDline(id string) error {
|
||||
dlineKey := fmt.Sprintf(keyDlineEntry, id)
|
||||
func (dm *DLineManager) unpersistDline(id flatip.IPNet) error {
|
||||
dlineKey := fmt.Sprintf(keyDlineEntry, id.String())
|
||||
return dm.server.store.Update(func(tx *buntdb.Tx) error {
|
||||
_, err := tx.Delete(dlineKey)
|
||||
return err
|
||||
@ -212,7 +197,7 @@ func (dm *DLineManager) RemoveNetwork(network net.IPNet) error {
|
||||
dm.persistenceMutex.Lock()
|
||||
defer dm.persistenceMutex.Unlock()
|
||||
|
||||
id := utils.NetToNormalizedString(utils.NormalizeNet(network))
|
||||
id := flatip.FromNetIPNet(network)
|
||||
|
||||
present := func() bool {
|
||||
dm.Lock()
|
||||
@ -241,8 +226,7 @@ func (dm *DLineManager) RemoveIP(addr net.IP) error {
|
||||
}
|
||||
|
||||
// CheckIP returns whether or not an IP address was banned, and how long it is banned for.
|
||||
func (dm *DLineManager) CheckIP(addr net.IP) (isBanned bool, info IPBanInfo) {
|
||||
addr = addr.To16() // almost certainly unnecessary
|
||||
func (dm *DLineManager) CheckIP(addr flatip.IP) (isBanned bool, info IPBanInfo) {
|
||||
if addr.IsLoopback() {
|
||||
return // #671
|
||||
}
|
||||
@ -252,13 +236,12 @@ func (dm *DLineManager) CheckIP(addr net.IP) (isBanned bool, info IPBanInfo) {
|
||||
|
||||
// check networks
|
||||
// TODO(slingamn) use a radix tree as the data plane for this
|
||||
for _, netBan := range dm.networks {
|
||||
if netBan.Network.Contains(addr) {
|
||||
return true, netBan.Info
|
||||
for flatnet, info := range dm.networks {
|
||||
if flatnet.Contains(addr) {
|
||||
return true, info
|
||||
}
|
||||
}
|
||||
// no matches!
|
||||
isBanned = false
|
||||
return
|
||||
}
|
||||
|
||||
|
||||
33
irc/flatip/adhoc.go
Normal file
33
irc/flatip/adhoc.go
Normal file
@ -0,0 +1,33 @@
|
||||
// Copyright 2020 Shivaram Lingamneni <slingamn@cs.stanford.edu>
|
||||
// Released under the MIT license
|
||||
|
||||
package flatip
|
||||
|
||||
// begin ad-hoc utilities
|
||||
|
||||
// ParseToNormalizedNet attempts to interpret a string either as an IP
|
||||
// network in CIDR notation, returning an IPNet, or as an IP address,
|
||||
// returning an IPNet that contains only that address.
|
||||
func ParseToNormalizedNet(netstr string) (ipnet IPNet, err error) {
|
||||
_, ipnet, err = ParseCIDR(netstr)
|
||||
if err == nil {
|
||||
return
|
||||
}
|
||||
ip, err := ParseIP(netstr)
|
||||
if err == nil {
|
||||
ipnet.IP = ip
|
||||
ipnet.PrefixLen = 128
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// IPInNets is a convenience function for testing whether an IP is contained
|
||||
// in any member of a slice of IPNet's.
|
||||
func IPInNets(addr IP, nets []IPNet) bool {
|
||||
for _, net := range nets {
|
||||
if net.Contains(addr) {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
202
irc/flatip/flatip.go
Normal file
202
irc/flatip/flatip.go
Normal file
@ -0,0 +1,202 @@
|
||||
// Copyright 2020 Shivaram Lingamneni <slingamn@cs.stanford.edu>
|
||||
// Copyright 2009 The Go Authors
|
||||
// Released under the MIT license
|
||||
|
||||
package flatip
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"errors"
|
||||
"net"
|
||||
)
|
||||
|
||||
var (
|
||||
v4InV6Prefix = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff}
|
||||
|
||||
IPv6loopback = IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}
|
||||
IPv6zero = IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
|
||||
IPv4zero = IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 0, 0, 0, 0}
|
||||
|
||||
ErrInvalidIPString = errors.New("String could not be interpreted as an IP address")
|
||||
)
|
||||
|
||||
// packed versions of net.IP and net.IPNet; these are pure value types,
|
||||
// so they can be compared with == and used as map keys.
|
||||
|
||||
// IP is a 128-bit representation of an IP address, using the 4-in-6 mapping
|
||||
// to represent IPv4 addresses.
|
||||
type IP [16]byte
|
||||
|
||||
// IPNet is a IP network. In a valid value, all bits after PrefixLen are zeroes.
|
||||
type IPNet struct {
|
||||
IP
|
||||
PrefixLen uint8
|
||||
}
|
||||
|
||||
// NetIP converts an IP into a net.IP.
|
||||
func (ip IP) NetIP() (result net.IP) {
|
||||
result = make(net.IP, 16)
|
||||
copy(result[:], ip[:])
|
||||
return
|
||||
}
|
||||
|
||||
// FromNetIP converts a net.IP into an IP.
|
||||
func FromNetIP(ip net.IP) (result IP) {
|
||||
if len(ip) == 16 {
|
||||
copy(result[:], ip[:])
|
||||
} else {
|
||||
result[10] = 0xff
|
||||
result[11] = 0xff
|
||||
copy(result[12:], ip[:])
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// IPv4 returns the IP address representation of a.b.c.d
|
||||
func IPv4(a, b, c, d byte) (result IP) {
|
||||
copy(result[:12], v4InV6Prefix)
|
||||
result[12] = a
|
||||
result[13] = b
|
||||
result[14] = c
|
||||
result[15] = d
|
||||
return
|
||||
}
|
||||
|
||||
// ParseIP parses a string representation of an IP address into an IP.
|
||||
// Unlike net.ParseIP, it returns an error instead of a zero value on failure,
|
||||
// since the zero value of `IP` is a representation of a valid IP (::0, the
|
||||
// IPv6 "unspecified address").
|
||||
func ParseIP(ipstr string) (ip IP, err error) {
|
||||
// TODO reimplement this without net.ParseIP
|
||||
netip := net.ParseIP(ipstr)
|
||||
if netip == nil {
|
||||
err = ErrInvalidIPString
|
||||
return
|
||||
}
|
||||
netip = netip.To16()
|
||||
copy(ip[:], netip)
|
||||
return
|
||||
}
|
||||
|
||||
// String returns the string representation of an IP
|
||||
func (ip IP) String() string {
|
||||
// TODO reimplement this without using (net.IP).String()
|
||||
return (net.IP)(ip[:]).String()
|
||||
}
|
||||
|
||||
// IsIPv4 returns whether the IP is an IPv4 address.
|
||||
func (ip IP) IsIPv4() bool {
|
||||
return bytes.Equal(ip[:12], v4InV6Prefix)
|
||||
}
|
||||
|
||||
// IsLoopback returns whether the IP is a loopback address.
|
||||
func (ip IP) IsLoopback() bool {
|
||||
if ip.IsIPv4() {
|
||||
return ip[12] == 127
|
||||
} else {
|
||||
return ip == IPv6loopback
|
||||
}
|
||||
}
|
||||
|
||||
func (ip IP) IsUnspecified() bool {
|
||||
return ip == IPv4zero || ip == IPv6zero
|
||||
}
|
||||
|
||||
func rawCidrMask(length int) (m IP) {
|
||||
n := uint(length)
|
||||
for i := 0; i < 16; i++ {
|
||||
if n >= 8 {
|
||||
m[i] = 0xff
|
||||
n -= 8
|
||||
continue
|
||||
}
|
||||
m[i] = ^byte(0xff >> n)
|
||||
return
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (ip IP) applyMask(mask IP) (result IP) {
|
||||
for i := 0; i < 16; i += 1 {
|
||||
result[i] = ip[i] & mask[i]
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func cidrMask(ones, bits int) (result IP) {
|
||||
switch bits {
|
||||
case 32:
|
||||
return rawCidrMask(96 + ones)
|
||||
case 128:
|
||||
return rawCidrMask(ones)
|
||||
default:
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
// Mask returns the result of masking ip with the CIDR mask of
|
||||
// length 'ones', out of a total of 'bits' (which must be either
|
||||
// 32 for an IPv4 subnet or 128 for an IPv6 subnet).
|
||||
func (ip IP) Mask(ones, bits int) (result IP) {
|
||||
return ip.applyMask(cidrMask(ones, bits))
|
||||
}
|
||||
|
||||
// ToNetIPNet converts an IPNet into a net.IPNet.
|
||||
func (cidr IPNet) ToNetIPNet() (result net.IPNet) {
|
||||
return net.IPNet{
|
||||
IP: cidr.IP.NetIP(),
|
||||
Mask: net.CIDRMask(int(cidr.PrefixLen), 128),
|
||||
}
|
||||
}
|
||||
|
||||
// Contains retuns whether the network contains `ip`.
|
||||
func (cidr IPNet) Contains(ip IP) bool {
|
||||
maskedIP := ip.Mask(int(cidr.PrefixLen), 128)
|
||||
return cidr.IP == maskedIP
|
||||
}
|
||||
|
||||
// FromNetIPnet converts a net.IPNet into an IPNet.
|
||||
func FromNetIPNet(network net.IPNet) (result IPNet) {
|
||||
ones, _ := network.Mask.Size()
|
||||
if len(network.IP) == 16 {
|
||||
copy(result.IP[:], network.IP[:])
|
||||
} else {
|
||||
result.IP[10] = 0xff
|
||||
result.IP[11] = 0xff
|
||||
copy(result.IP[12:], network.IP[:])
|
||||
ones += 96
|
||||
}
|
||||
// perform masking so that equal CIDRs are ==
|
||||
result.IP = result.IP.Mask(ones, 128)
|
||||
result.PrefixLen = uint8(ones)
|
||||
return
|
||||
}
|
||||
|
||||
// String returns a string representation of an IPNet.
|
||||
func (cidr IPNet) String() string {
|
||||
ip := make(net.IP, 16)
|
||||
copy(ip[:], cidr.IP[:])
|
||||
ipnet := net.IPNet{
|
||||
IP: ip,
|
||||
Mask: net.CIDRMask(int(cidr.PrefixLen), 128),
|
||||
}
|
||||
return ipnet.String()
|
||||
}
|
||||
|
||||
// IsZero tests whether ipnet is the zero value of an IPNet, 0::0/0.
|
||||
// Although this is a valid subnet, it can still be used as a sentinel
|
||||
// value in some contexts.
|
||||
func (ipnet IPNet) IsZero() bool {
|
||||
return ipnet == IPNet{}
|
||||
}
|
||||
|
||||
// ParseCIDR parses a string representation of an IP network in CIDR notation,
|
||||
// then returns it as an IPNet (along with the original, unmasked address).
|
||||
func ParseCIDR(netstr string) (ip IP, ipnet IPNet, err error) {
|
||||
// TODO reimplement this without net.ParseCIDR
|
||||
nip, nipnet, err := net.ParseCIDR(netstr)
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
return FromNetIP(nip), FromNetIPNet(*nipnet), nil
|
||||
}
|
||||
174
irc/flatip/flatip_test.go
Normal file
174
irc/flatip/flatip_test.go
Normal file
@ -0,0 +1,174 @@
|
||||
package flatip
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"math/rand"
|
||||
"net"
|
||||
"testing"
|
||||
"time"
|
||||
)
|
||||
|
||||
func easyParseIP(ipstr string) (result net.IP) {
|
||||
result = net.ParseIP(ipstr)
|
||||
if result == nil {
|
||||
panic(ipstr)
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func easyParseFlat(ipstr string) (result IP) {
|
||||
x := easyParseIP(ipstr)
|
||||
return FromNetIP(x)
|
||||
}
|
||||
|
||||
func easyParseIPNet(nipstr string) (result net.IPNet) {
|
||||
_, nip, err := net.ParseCIDR(nipstr)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
return *nip
|
||||
}
|
||||
|
||||
func TestBasic(t *testing.T) {
|
||||
nip := easyParseIP("8.8.8.8")
|
||||
flatip := FromNetIP(nip)
|
||||
if flatip.String() != "8.8.8.8" {
|
||||
t.Errorf("conversions don't work")
|
||||
}
|
||||
}
|
||||
|
||||
func TestLoopback(t *testing.T) {
|
||||
localhost_v4 := easyParseFlat("127.0.0.1")
|
||||
localhost_v4_again := easyParseFlat("127.2.3.4")
|
||||
google := easyParseFlat("8.8.8.8")
|
||||
loopback_v6 := easyParseFlat("::1")
|
||||
google_v6 := easyParseFlat("2607:f8b0:4006:801::2004")
|
||||
|
||||
if !(localhost_v4.IsLoopback() && localhost_v4_again.IsLoopback() && loopback_v6.IsLoopback()) {
|
||||
t.Errorf("can't detect loopbacks")
|
||||
}
|
||||
|
||||
if google_v6.IsLoopback() || google.IsLoopback() {
|
||||
t.Errorf("incorrectly detected loopbacks")
|
||||
}
|
||||
}
|
||||
|
||||
func TestContains(t *testing.T) {
|
||||
nipnet := easyParseIPNet("8.8.0.0/16")
|
||||
flatipnet := FromNetIPNet(nipnet)
|
||||
nip := easyParseIP("8.8.8.8")
|
||||
flatip_ := FromNetIP(nip)
|
||||
if !flatipnet.Contains(flatip_) {
|
||||
t.Errorf("contains doesn't work")
|
||||
}
|
||||
}
|
||||
|
||||
var testIPStrs = []string{
|
||||
"8.8.8.8",
|
||||
"127.0.0.1",
|
||||
"1.1.1.1",
|
||||
"128.127.65.64",
|
||||
"2001:0db8::1",
|
||||
"::1",
|
||||
"255.255.255.255",
|
||||
}
|
||||
|
||||
func doMaskingTest(ip net.IP, t *testing.T) {
|
||||
flat := FromNetIP(ip)
|
||||
netLen := len(ip) * 8
|
||||
for i := 0; i < netLen; i++ {
|
||||
masked := flat.Mask(i, netLen)
|
||||
netMask := net.CIDRMask(i, netLen)
|
||||
netMasked := ip.Mask(netMask)
|
||||
if !bytes.Equal(masked[:], netMasked.To16()) {
|
||||
t.Errorf("Masking %s with %d/%d; expected %s, got %s", ip.String(), i, netLen, netMasked.String(), masked.String())
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestMasking(t *testing.T) {
|
||||
for _, ipstr := range testIPStrs {
|
||||
doMaskingTest(easyParseIP(ipstr), t)
|
||||
}
|
||||
}
|
||||
|
||||
func TestMaskingFuzz(t *testing.T) {
|
||||
r := rand.New(rand.NewSource(time.Now().UnixNano()))
|
||||
buf := make([]byte, 4)
|
||||
for i := 0; i < 10000; i++ {
|
||||
r.Read(buf)
|
||||
doMaskingTest(net.IP(buf), t)
|
||||
}
|
||||
|
||||
buf = make([]byte, 16)
|
||||
for i := 0; i < 10000; i++ {
|
||||
r.Read(buf)
|
||||
doMaskingTest(net.IP(buf), t)
|
||||
}
|
||||
}
|
||||
|
||||
func BenchmarkMasking(b *testing.B) {
|
||||
ip := easyParseIP("2001:0db8::42")
|
||||
flat := FromNetIP(ip)
|
||||
b.ResetTimer()
|
||||
|
||||
for i := 0; i < b.N; i++ {
|
||||
flat.Mask(64, 128)
|
||||
}
|
||||
}
|
||||
|
||||
func BenchmarkMaskingLegacy(b *testing.B) {
|
||||
ip := easyParseIP("2001:0db8::42")
|
||||
mask := net.CIDRMask(64, 128)
|
||||
b.ResetTimer()
|
||||
|
||||
for i := 0; i < b.N; i++ {
|
||||
ip.Mask(mask)
|
||||
}
|
||||
}
|
||||
|
||||
func BenchmarkMaskingCached(b *testing.B) {
|
||||
i := easyParseIP("2001:0db8::42")
|
||||
flat := FromNetIP(i)
|
||||
mask := cidrMask(64, 128)
|
||||
b.ResetTimer()
|
||||
|
||||
for i := 0; i < b.N; i++ {
|
||||
flat.applyMask(mask)
|
||||
}
|
||||
}
|
||||
|
||||
func BenchmarkMaskingConstruct(b *testing.B) {
|
||||
for i := 0; i < b.N; i++ {
|
||||
cidrMask(69, 128)
|
||||
}
|
||||
}
|
||||
|
||||
func BenchmarkContains(b *testing.B) {
|
||||
ip := easyParseIP("2001:0db8::42")
|
||||
flat := FromNetIP(ip)
|
||||
_, ipnet, err := net.ParseCIDR("2001:0db8::/64")
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
flatnet := FromNetIPNet(*ipnet)
|
||||
b.ResetTimer()
|
||||
|
||||
for i := 0; i < b.N; i++ {
|
||||
flatnet.Contains(flat)
|
||||
}
|
||||
}
|
||||
|
||||
func BenchmarkContainsLegacy(b *testing.B) {
|
||||
ip := easyParseIP("2001:0db8::42")
|
||||
_, ipnetptr, err := net.ParseCIDR("2001:0db8::/64")
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
ipnet := *ipnetptr
|
||||
b.ResetTimer()
|
||||
|
||||
for i := 0; i < b.N; i++ {
|
||||
ipnet.Contains(ip)
|
||||
}
|
||||
}
|
||||
@ -9,6 +9,7 @@ import (
|
||||
"errors"
|
||||
"net"
|
||||
|
||||
"github.com/oragono/oragono/irc/flatip"
|
||||
"github.com/oragono/oragono/irc/modes"
|
||||
"github.com/oragono/oragono/irc/utils"
|
||||
)
|
||||
@ -87,7 +88,7 @@ func (client *Client) ApplyProxiedIP(session *Session, proxiedIP net.IP, tls boo
|
||||
}
|
||||
// successfully added a limiter entry for the proxied IP;
|
||||
// remove the entry for the real IP if applicable (#197)
|
||||
client.server.connectionLimiter.RemoveClient(session.realIP)
|
||||
client.server.connectionLimiter.RemoveClient(flatip.FromNetIP(session.realIP))
|
||||
|
||||
// given IP is sane! override the client's current IP
|
||||
client.server.logger.Info("connect-ip", "Accepted proxy IP for client", proxiedIP.String())
|
||||
|
||||
@ -24,6 +24,7 @@ import (
|
||||
"github.com/goshuirc/irc-go/ircmsg"
|
||||
"github.com/oragono/oragono/irc/caps"
|
||||
"github.com/oragono/oragono/irc/custime"
|
||||
"github.com/oragono/oragono/irc/flatip"
|
||||
"github.com/oragono/oragono/irc/history"
|
||||
"github.com/oragono/oragono/irc/jwt"
|
||||
"github.com/oragono/oragono/irc/modes"
|
||||
@ -2798,6 +2799,11 @@ func unDLineHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *R
|
||||
// get host
|
||||
hostString := msg.Params[0]
|
||||
|
||||
// TODO(#1447) consolidate this into the "unban" command
|
||||
if flatip, ipErr := flatip.ParseIP(hostString); ipErr == nil {
|
||||
server.connectionLimiter.ResetThrottle(flatip)
|
||||
}
|
||||
|
||||
// check host
|
||||
hostNet, err := utils.NormalizedNetFromString(hostString)
|
||||
|
||||
|
||||
@ -23,6 +23,7 @@ import (
|
||||
|
||||
"github.com/oragono/oragono/irc/caps"
|
||||
"github.com/oragono/oragono/irc/connection_limits"
|
||||
"github.com/oragono/oragono/irc/flatip"
|
||||
"github.com/oragono/oragono/irc/history"
|
||||
"github.com/oragono/oragono/irc/logger"
|
||||
"github.com/oragono/oragono/irc/modes"
|
||||
@ -160,31 +161,23 @@ func (server *Server) checkBans(config *Config, ipaddr net.IP, checkScripts bool
|
||||
}
|
||||
}
|
||||
|
||||
flat := flatip.FromNetIP(ipaddr)
|
||||
|
||||
// check DLINEs
|
||||
isBanned, info := server.dlines.CheckIP(ipaddr)
|
||||
isBanned, info := server.dlines.CheckIP(flat)
|
||||
if isBanned {
|
||||
server.logger.Info("connect-ip", fmt.Sprintf("Client from %v rejected by d-line", ipaddr))
|
||||
server.logger.Info("connect-ip", "Client rejected by d-line", ipaddr.String())
|
||||
return true, false, info.BanMessage("You are banned from this server (%s)")
|
||||
}
|
||||
|
||||
// check connection limits
|
||||
err := server.connectionLimiter.AddClient(ipaddr)
|
||||
err := server.connectionLimiter.AddClient(flat)
|
||||
if err == connection_limits.ErrLimitExceeded {
|
||||
// too many connections from one client, tell the client and close the connection
|
||||
server.logger.Info("connect-ip", fmt.Sprintf("Client from %v rejected for connection limit", ipaddr))
|
||||
server.logger.Info("connect-ip", "Client rejected for connection limit", ipaddr.String())
|
||||
return true, false, "Too many clients from your network"
|
||||
} else if err == connection_limits.ErrThrottleExceeded {
|
||||
duration := config.Server.IPLimits.BanDuration
|
||||
if duration != 0 {
|
||||
server.dlines.AddIP(ipaddr, duration, throttleMessage,
|
||||
"Exceeded automated connection throttle", "auto.connection.throttler")
|
||||
// they're DLINE'd for 15 minutes or whatever, so we can reset the connection throttle now,
|
||||
// and once their temporary DLINE is finished they can fill up the throttler again
|
||||
server.connectionLimiter.ResetThrottle(ipaddr)
|
||||
}
|
||||
server.logger.Info(
|
||||
"connect-ip",
|
||||
fmt.Sprintf("Client from %v exceeded connection throttle, d-lining for %v", ipaddr, duration))
|
||||
server.logger.Info("connect-ip", "Client exceeded connection throttle", ipaddr.String())
|
||||
return true, false, throttleMessage
|
||||
} else if err != nil {
|
||||
server.logger.Warning("internal", "unexpected ban result", err.Error())
|
||||
@ -211,7 +204,7 @@ func (server *Server) checkBans(config *Config, ipaddr net.IP, checkScripts bool
|
||||
}
|
||||
if output.Result == IPBanned {
|
||||
// XXX roll back IP connection/throttling addition for the IP
|
||||
server.connectionLimiter.RemoveClient(ipaddr)
|
||||
server.connectionLimiter.RemoveClient(flat)
|
||||
server.logger.Info("connect-ip", "Rejected client due to ip-check-script", ipaddr.String())
|
||||
return true, false, output.BanMessage
|
||||
} else if output.Result == IPRequireSASL {
|
||||
|
||||
@ -220,9 +220,6 @@ server:
|
||||
window: 10m
|
||||
# maximum number of new connections per IP/CIDR within the given duration
|
||||
max-connections-per-window: 32
|
||||
# how long to ban offenders for. after banning them, the number of connections is
|
||||
# reset, which lets you use /UNDLINE to unban people
|
||||
throttle-ban-duration: 10m
|
||||
|
||||
# how wide the CIDR should be for IPv4 (a /32 is a fully specified IPv4 address)
|
||||
cidr-len-ipv4: 32
|
||||
|
||||
Loading…
Reference in New Issue
Block a user